Vectorization

Conversion of raster graphics into vector graphics is known as Vectorization  or Image tracing.
Classic example is when satellite captures images, they cectorize it to create maps.

There are many algorithms for Vectorization. There is no single defined clear cut algorithm for this.
Some of them are
1) Sobel
2) Canny Edge
3) Roberts Cross
4) Sparse Pixel
5) MaxDistanceVectorizer
6) LineVectorizer
7) DirectionBasedVectorizer

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